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The Intelligent Updater is an executable file that can be used to update virus definitions for the Symantec Endpoint Protection client. To update the definitions, run either the Daily Certified or Rapid Release Intelligent Updater on the local computer. Refer this: http://www.symantec.com/docs/TECH102606
Available Command-Line Options for Intelligent Updater (Version 5)
Version 5 Intelligent Updater files are distinguished from Version 4 files by the "v5" string in the IU filename. Example: 20070817-009-v5i32.exe
When executed at a command line, the Intelligent Updater (Version 5) uses the following syntax:
Filename.exe [/?][/extract<file><path>][/list][/q][/r]
/q will run it in silent or unattended mode.
Refer this: http://www.symantec.com/docs/TECH102351